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enc_writ.c

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/home/opencoverage/opencoverage/guest-scripts/libressl/src/crypto/des/enc_writ.c

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1 /* $OpenBSD: enc_writ.c,v 1.14 2015/02/12 03:54:07 jsing Exp $ */ -

4 * -

5 * This package is an SSL implementation written -

6 * by Eric Young (eay@cryptsoft.com). -

7 * The implementation was written so as to conform with Netscapes SSL. -

8 * -

9 * This library is free for commercial and non-commercial use as long as -

10 * the following conditions are aheared to. The following conditions -

11 * apply to all code found in this distribution, be it the RC4, RSA, -

12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation -

13 * included with this distribution is covered by the same copyright terms -

14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). -

15 * -

16 * Copyright remains Eric Young's, and as such any Copyright notices in -

17 * the code are not to be removed. -

18 * If this package is used in a product, Eric Young should be given attribution -

19 * as the author of the parts of the library used. -

20 * This can be in the form of a textual message at program startup or -

21 * in documentation (online or textual) provided with the package. -

22 * -

23 * Redistribution and use in source and binary forms, with or without -

24 * modification, are permitted provided that the following conditions -

25 * are met: -

26 * 1. Redistributions of source code must retain the copyright -

27 * notice, this list of conditions and the following disclaimer. -

28 * 2. Redistributions in binary form must reproduce the above copyright -

29 * notice, this list of conditions and the following disclaimer in the -

30 * documentation and/or other materials provided with the distribution. -

31 * 3. All advertising materials mentioning features or use of this software -

32 * must display the following acknowledgement: -

33 * "This product includes cryptographic software written by -

34 * Eric Young (eay@cryptsoft.com)" -

35 * The word 'cryptographic' can be left out if the rouines from the library -

36 * being used are not cryptographic related :-). -

37 * 4. If you include any Windows specific code (or a derivative thereof) from -

38 * the apps directory (application code) you must include an acknowledgement: -

39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" -

40 * -

41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND -

42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -

43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -

44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE -

45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -

46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -

47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -

48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -

49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -

50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -

51 * SUCH DAMAGE. -

52 * -

53 * The licence and distribution terms for any publically available version or -

54 * derivative of this code cannot be changed. i.e. this code cannot simply be -

55 * copied and put under another distribution licence -

56 * [including the GNU Public Licence.] -

57 */ -

58 -

59 #include <errno.h> -

60 #include <stdio.h> -

61 #include <stdlib.h> -

62 #include <time.h> -

63 -

64 #include <openssl/opensslconf.h> -

65 -

66 #include "des_locl.h" -

67 -

68 /* -

69 * WARNINGS: -

70 * -

71 * - The data format used by DES_enc_write() and DES_enc_read() -

72 * has a cryptographic weakness: When asked to write more -

73 * than MAXWRITE bytes, DES_enc_write will split the data -

74 * into several chunks that are all encrypted -

75 * using the same IV. So don't use these functions unless you -

76 * are sure you know what you do (in which case you might -

77 * not want to use them anyway). -

78 * -

79 * - This code cannot handle non-blocking sockets. -

80 */ -

81 -

82 int DES_enc_write(int fd, const void *_buf, int len, -

83 DES_key_schedule *sched, DES_cblock *iv) -

84 { -

85 #ifdef _LIBC -

86 extern unsigned long time(); -

87 extern int write(); -

88 #endif -

89 const unsigned char *buf=_buf; -

90 long rnum; -

91 int i,j,k,outnum; -

92 static unsigned char *outbuf=NULL; -

93 unsigned char shortbuf[8]; -

94 unsigned char *p; -

95 const unsigned char *cp; -

96 static int start=1; -

97 -

if (outbuf == NULL)

outbuf == ((void *)0)	Description
TRUE	never evaluated
FALSE	never evaluated

99 { -

100 outbuf=malloc(BSIZE+HDRSIZE); -

101

if (outbuf == NULL) return(-1);

never executed: return(-1);

outbuf == ((void *)0)	Description
TRUE	never evaluated
FALSE	never evaluated

102

}

never executed: end of block

103 /* If we are sending less than 8 bytes, the same char will look -

104 * the same if we don't pad it out with random bytes */ -

105

if (start)

start	Description
TRUE	never evaluated
FALSE	never evaluated

106 { -

107 start=0; -

108

}

never executed: end of block

109 -

110 /* lets recurse if we want to send the data in small chunks */ -

111

if (len > MAXWRITE)

len > (1024*16)	Description
TRUE	never evaluated
FALSE	never evaluated

112 { -

113 j=0; -

114

for (i=0; i<len; i+=k)

i<len	Description
TRUE	never evaluated
FALSE	never evaluated

115 { -

116 k=DES_enc_write(fd,&(buf[i]), -

117 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv); -

118

if (k < 0)

k < 0	Description
TRUE	never evaluated
FALSE	never evaluated

119

return(k);

never executed: return(k);

120 else -

121

j+=k;

never executed: j+=k;

122 } -

123

return(j);

never executed: return(j);

124 } -

125 -

126 /* write length first */ -

127 p=outbuf; -

128 l2n(len,p); -

129 -

130 /* pad short strings */ -

131

if (len < 8)

len < 8	Description
TRUE	never evaluated
FALSE	never evaluated

132 { -

133 cp=shortbuf; -

134 memcpy(shortbuf,buf,len); -

135 arc4random_buf(shortbuf+len, 8-len); -

136 rnum=8; -

137

}

never executed: end of block

138 else -

139 { -

140 cp=buf; -

141 rnum=((len+7)/8*8); /* round up to nearest eight */ -

142

}

never executed: end of block

143 -

144

if (DES_rw_mode & DES_PCBC_MODE)

DES_rw_mode & 1	Description
TRUE	never evaluated
FALSE	never evaluated

145

DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,

never executed: DES_pcbc_encrypt(cp,&(outbuf[4]),(len<8)?8:len,sched,iv, 1);

146

DES_ENCRYPT);

never executed: DES_pcbc_encrypt(cp,&(outbuf[4]),(len<8)?8:len,sched,iv, 1);

147 else -

148

DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,

never executed: DES_cbc_encrypt(cp,&(outbuf[4]),(len<8)?8:len,sched,iv, 1);

149

DES_ENCRYPT);

never executed: DES_cbc_encrypt(cp,&(outbuf[4]),(len<8)?8:len,sched,iv, 1);

150 -

151 /* output */ -

152 outnum=rnum+HDRSIZE; -

153 -

154

for (j=0; j<outnum; j+=i)

j<outnum	Description
TRUE	never evaluated
FALSE	never evaluated

155 { -

156 /* eay 26/08/92 I was not doing writing from where we -

157 * got up to. */ -

158 i=write(fd,(void *)&(outbuf[j]),outnum-j); -

159

if (i == -1)

i == -1	Description
TRUE	never evaluated
FALSE	never evaluated

160 { -

161 #ifdef EINTR -

162

if (errno == EINTR)

(*__errno_location ()) == 4	Description
TRUE	never evaluated
FALSE	never evaluated

163

i=0;

never executed: i=0;

164 else -

165 #endif -

166 /* This is really a bad error - very bad -

167 * It will stuff-up both ends. */ -

168

return(-1);

never executed: return(-1);

169 } -

170

}

never executed: end of block

171 -

172

return(len);

never executed: return(len);

173 } -

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